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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb40735ad68d71b9997fcb73c535b6d1eb01875fca8203d9feb9b1b07b9d631e' 
  AND token = 'wJJkcQD8yBLbFBF9h4C4hDGqB0BCsP2d3M4knJVE200=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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