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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537af126ddad6e097ffe9225c8a3e8d1d406d3585130b4064b76d0159390636d' 
  AND token = 'Ed2Q/aPdGDBfGGN891nuM7NzlcsnO/Tl7A4SW3ORHaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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