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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09d2bbc1e9d1a21a93a17ed7cad381e4a7acc73a379706622544aac64bec58b' 
  AND token = '7pK6fgxgffuQsHvbQN/uipdU0unBAMqambATLdeUnHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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