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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4da42fab672e1a954ec186e1284d43ac44ec40db8538a7f81813c038fa41cdc' 
  AND token = '/6dpMHJVWfL7nigx2L2A9dalhAcL0atwwNCXdywpnsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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