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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1f232549934ff6603e0e853497368de649a6548ef708da02b55ad2110577a1' 
  AND token = 'LjnrasvdeGwBjI7sw9xz0K27zFKLy+nAPdyrukSthac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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