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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f787630a8f810328a88875b580a24bd47983d134d02679b77bfbc554b1ac319' 
  AND token = 'D40wypde4dGLdLm2n2RnYfMOkHNDPYo+3jHvyxJDrYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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