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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a511cd2559e87e69ccb27f7310bb5d0b4d93f44c78655ff495f0661326d56da8' 
  AND token = 'WrNeBUbAI2r4nAw6bQRPOvxW+6i/0I+qOZu017tBWY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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