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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cee7c28e9ff9c2b80a3e5fb5adcbc2ca4113b4ebfd26d6597dc8bd546c1a437' 
  AND token = 'yPhYQeW3FwSyTgTRbpnfoBHA1G/z2L+izmb81n+o69A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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