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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418415c4b61856a7926745272296ca171779d32ebd6aa6bc507b4e2ce04bc2d3' 
  AND token = '1tb7HNYRNAMCrVJXjjwXTEtEnfVt2P4b+X/l5x35JX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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