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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f93e74c2884f363b4ea93be793924cea0fa3a6f796e963721e17bfcf4ed28e' 
  AND token = '3pHVjB4RQaesZxgo3z4I0jDMJv28ReUtMu5aCL0/WoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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