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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372bb61e6a42f7703f3c6dd9decd6ac0a1c7abe64a21a0856a1ce411ebdcc176' 
  AND token = 'Anw5mmsWt4jXysJJBeRG/4DW97Ubo4rsrX4W6nOiJEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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