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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bbef13bddf29dc27e142f4eae8dcc39fa4f6080fc369be93752108ee2b91b5' 
  AND token = 'HmyHPrTIN1bty2MaNrFynSJZiFRDnuD/sKSB7Bz90mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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