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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5badd9cf89539a2001189fe236095367ddcd7824de741777098179d169ddea74' 
  AND token = 'Sl+AvR3C8f8DGUn0xuHnknRov5u5aI791w5wY0C5bd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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