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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c312d514f40a0f030f2be99a6654ed11c5b4b2a77933f0c02b4405230d6711' 
  AND token = 'BF+qiQwlFfzoJvTN8jeJud18ka/BWGrfBfeqi5g0dEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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