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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a1a327adf7902b7d3e4d15c1090a90c23512257783d86ee62b574428160ef6' 
  AND token = 'Sgy/coDniycuwThjq9PQJrTA40uXf+x25oBOnSmv9j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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