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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b0b04af1e7ea8569f91a13e95f08d2175d551dd80eff57c29e3f1d8bc8ef8a' 
  AND token = 'HzdZ94QwnG0SLMcLMCG3UdOKHvy8tStme7/7HRgSB04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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