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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215826b213d6d6a954df85f11c0042d78878d164309bb6e1b26a22cf32eac007' 
  AND token = 'Aj/rPpHNJK8it+kAr2KkWELLtBIObTzUsyVzzR+1BbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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