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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40971e9a57dcdf9ea4f713eeb58483ddbc2b5d7edc19e2b69afa62c8610f519e' 
  AND token = '6MX0+uBEaX0afu8PTLVPEVUPInuM7Z392R1vL30KkY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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