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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e136803f653828887aa281d19194f338dfcf7b182857f9c969cd7c3a9aa9b13f' 
  AND token = 'r5H3IsBwCX7VAcJD3uH2ZpzNmySrquhnhjfnoeY1A5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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