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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8d48ee0bcafc60af770c284523afc694ec11195492dfd46d532268a402dcbe' 
  AND token = 'A3rCRrxy5FSodOE5zT7SRoY3uMM43q6yprrEqs6XFjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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