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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf96a0d234f0a981b012d07e8d5490346ae999cea4ecedeb7b458dd4b7fdac1e' 
  AND token = 'PITy7E/5pK/yYXIIrJ5+hDR+Q+Rn7hcUbO5DOvkyR1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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