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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897d4db6a80e5ee8686e75c7827d79edbe7979a51af0419db9e7a562068a404d' 
  AND token = 'TdOoiDPiEPv9F8PNDVy9bHHkuR6JcNNs9/r3/US6CUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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