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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51645cf3b81eb7c585086db3085465792e254781eabb2e6915ad9fc2826aba73' 
  AND token = 'p9IoZTpuYAttwhPLC7Fl6ej5iFEUOMtZ3Fb777EDd9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}