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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0abe2825b204a97ccc78b4e8df51b45be7777683440fe4589788d71d65f96f95' 
  AND token = '18Y+2ULf9vTWAQxHJOYfHg4h1luQOMHsvLfhE0twY1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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