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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d2a4b55b93c27827c0ecda46e1585cea046dfc174ee05d3cb003414b08d12d' 
  AND token = 'Dco+s4tvAU4lYLqyhD2kx0kniCBiGIUx6FiRoG5a4Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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