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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1f9700203611b6f00860a18431d3cb0c659bc81ece3fc42158ba85ea15f0e2' 
  AND token = 'b8mnZ63vJI4K18VRWvk+rnkp6LZUpf6mWX3DykI038k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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