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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36824b15f77e49a679210399cb64f4e5f6e5da172a75766d06f6f5a4f4142604' 
  AND token = 'sBBvHft8GDs0w+Qm6CaKG6uFGlBoSCdmcBnAgt2Q2cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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