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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296576c9b1603dba84c071d73c5b2af2be8a6c47efcd7404a7e26467c3d5d68e' 
  AND token = 'LSW6toSYkkyFFMRbq4l/V9PE0uH47+pzgF5IdDkcK1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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