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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9992583538bcb4b96dfa041de686093497873a817dc12ea95a5fe37e119ed738' 
  AND token = 'i09SEkQooFMcY3ulmzF+M7ryXKRUC5TeGcQgxsYcTB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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