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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876382d8ec163515eaa9da352aa0e60eee5ebcd0d73288ca8f645fa4558cf09a' 
  AND token = '/nRI+R9zoFfCW4wTcEkCz2uVZ7RwotUXA2/jpZihNxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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