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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5058a146f46eac3c86aa030fe2c37311286055b9121c0a5ae1f2c1083e4b6f2b' 
  AND token = 'yrVVObNFfvpfcf3i84L/62zXe38Fd6P8zVFtLnuMx8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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