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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9144f7a0bc29b1d6014a6809e4e4f4e8a1bb61f6a550ade89514e6f53463acd' 
  AND token = 'qnDwqL0cl2Q0m5ZVM6BPr1OGHGdy50P37r6vj2FFDXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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