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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bcc4dc7f2a2407f6789d47b94eb7ba3baa74e3593e09d5fca8f5e145c96b4d' 
  AND token = '6CA/h3okHQWrN5J8uqwldbrGTeWhEn0LhP6Ax4oF73E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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