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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7912d0807eae2379f1d0fb9c923904da10a352c74742d1c3ea07e97c69ac254' 
  AND token = 'BEb6yc8SeKUkxns+Nqg3n8K+x/Zmmo4kYUCEie2tfFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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