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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9ba4827e302c29eda0a17fa84544cbb77978484e2e91fe91357acc34694fb4' 
  AND token = 'xwADSRzwk8XKHXDBZxf9tv+p5SLp+1A7MzqNu9dJ33s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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