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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7931d1803546491011c33b588ffaf7f78f30a8d40ddaa12daa655be5e4d2a765' 
  AND token = 'JdEz2awQ0e+HkR66pI2Je45g1tybjN8DXtVkoBQFmek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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