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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51bc2e06048a3896e601e7e4b913103c60d79449894e5f2ee00f9d898e93c893' 
  AND token = 'eZ3JYi2szDXAdv9D2C2u3LgqHoBIwUkvkI54TR7boCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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