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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1735d2319d53387411274c42e07623251aadbf27ecab0e54e2102c416ac98ab4' 
  AND token = '1wy2r5adco+MaX+blc4fOUfF+jD1/Okttr81CQcMXZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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