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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e1b2e73fcd8423b02618f7f720653fcc8e4e34b7074acd61c7bbe43bd6beec' 
  AND token = '9SSsdP49smnrPiu0d3BPuJ/5+l9PNOUnYn3F0x3ajr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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