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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e9b7cbf26e436bfc8ba90c89d97093bea25a0ad7843e4a3a2ecdf1115bed02' 
  AND token = 'aaWNotly12Gk8DbgTYo3FDW26b31D23APubu4u1FIeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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