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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ddfc3a86e00d39a1d81ba516b70ccc473e689848a1d6852e75a47ab7d2e74c5' 
  AND token = 'BfoTeWOmgupuvDP5oovVTraDfdlCWY/CCtlKp4GbcuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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