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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a071c844f4a029f90d3084a18b2a4696c715e78a2e2e6c1c73b52edc5ef326' 
  AND token = 'dkRC5cOzaPlVcy49Ghvl5uaceVlu1cbT84QO+WjIAy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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