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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4283a4ac55a15a9f75fa7f1553b9924294a002bd0d8f86b242d549c522626d02' 
  AND token = 'wAOu9VCeeB7yakm2POuSahVQ3o810cbAQt9lD46I0h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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