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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1151dc06ec24ae8206174bbce277a98d94560968732aa84785ddb51cff23cc8' 
  AND token = 'cLE7Qs81T3leuU/QnT7PpSoIy2/+3e3TfjulxooMIFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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