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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628256feaf63a19523d701339124cacc6da05298d909c681fc5358b1a8e1a553' 
  AND token = 'w+IoX8P6CuJmfe38oSZ5oNep4JPh19Bpjq/7UzTwI1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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