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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955d1a0d0fb5e527305627ebcb0b10a0671c064047144e97f604e1e8d34e7cd3' 
  AND token = 'idfa4h6r/fi1qMTJo70slosK8h5i+VIShWh0X7PO5qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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