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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5411f9487d2468671e28aba6e3286d889e1dc254c80885b9ae4fa2079c38a65b' 
  AND token = 'Gxz/9N69+F3vDS1QdgCLrIJp+5THfLGEdu2VVmk3ybg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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