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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5516aaa4f38dced6d067b2c8e6c49ebf745cec3d4b1280078deb3bc62a70f9f3' 
  AND token = 'b1Fb01qZ7kS4tTnZHikeK7jz04FbGiyLIFQGrTrM3Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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