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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894fef19fe78bab03cd6dbf447467121945e50348d9ea9b2bcce3614e7437043' 
  AND token = '691iALwzKfn2uYVbsne1dG9tfd9TR875JKaeoetRd3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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