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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e7162df10f26ed6c6116621aa365abee7705c12e060b08695cdd55ae5116c0' 
  AND token = 'b220NU+lqd6GuAOM5Vk3xOpPMXM14GWxh/MH+MoGpEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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