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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb18bbe4450fe32ca9fefa26f369478aa2e300f9b53b672cefa76a031351f41' 
  AND token = 'xZdQgaLQzE7hKN0ImWelEJJgCy+lwZ5UW2yTyvsLbvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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