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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670627ce88ff3ad8060886e4a419e0d41035c107ddb6a9411f4f30c0d69bd048' 
  AND token = 'L99QEb7usP4tuxQXooj4cxCiter+CyaFPsos+VeMVQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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