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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b356ce3c77e20d1b119cf23aaa5b865f37f05d66d707716ff83731737832d4a5' 
  AND token = 'Pcrhu+fOwg7+HL/oevMSoaAJqZchHZ8USMs/YMSX+hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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