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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3fcb315481760f12c5f5633538c7abe082dd22abaff49bd66e5236a4b03bdb' 
  AND token = 'm4zuLpjlcnKA+KRz6T3WM5j2meI1R1ISqyPg3o7H0I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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