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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07ab3a372c49a52f478b601cd78910c9ba32dcdf2d6b6ff122f2411f120eb37' 
  AND token = 'U8ob00cAo+m90G1GqasMHNJwaNEV3TzeJIpqHYkiy4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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